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Acquisitions (Details) - TCF National Bank $ in Millions	May 25, 2021 USD ($) numberOfBusiness
Asset Acquisition [Line Items]
Number of businesses acquired | numberOfBusiness	14
Deposits	$ 976
Loans	$ 278

X

- Definition

Business acquisition purchase price allocation of deposits.

+ References

No definition available.

+ Details

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Namespace Prefix:	hbnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Business acquisition purchase price allocation loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	hbnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hbnc_TCFNationalBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: